I would like to invite whoever may be interested in SDR techniques for hams to visit www.flex-radio.com. Look for the articles and schematics. There are quite a few in pdf format.
The heart of the front end is a switching detector, that can handle signals almost as large as Vdd. It allows an even larger dynamic range than most SERIOUS radios. As it is a switch, nonlinearities are almost absent, compared to diode quads. Passive ring mixers using power mosfets might be comparable. A crude similarity is comparing the sampling detector with a high speed cutout, it only may be either open or closed. The receiver is a new variant of DC receiver with astonishing performance using a previously unusual solution. Read the four articles describing the transceiver. Bet you will be surprised. You might also read about the Tayloe detector, and an article published about it in the March 2003 issue of RF Design. There is also an article by Dr. R.V. Macario in RadCom in the early 70's, using a similar solution. Sorry I cannot remember now the exact issue. 73, Jose ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. __________________________________________ XIII Convención Científica de Ingeniería y Arquitectura 28/noviembre al 1/diciembre de 2006 Cujae, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/convencion Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
